Abstract

Above room temperature electronic transportproperties of SrxTiyO3−δfilms with cation A/B = (La + Sr/Nb + Ti) ratios of 0.9 to 1.2 are compared to STO single crystals with combined Hall carrier densities of 3 × 1016 cm−3 ≤ ≤ 1022 cm−3. In contrast to Hall mobility which is single crystal-like ( ≈ 6 cm2/Vs) only near A/B = 1, the Seebeck coefficient (S) is single crystal-like over a range of nonstoichiometry. For < 1020 cm−3, S is well described by nondegenerate band-like transport with a constant effective mass m∗ ≈ 5–8. For > 1021 cm−3, S is metallic-like with m∗ ∼ 8. No marked increase in m∗ with decreasing owing to a carrier filling dependence is observed.